There ________ a ruler and two pens on the desk.

There ________ a ruler and two pens on the desk. There( are )(a book)and (two pens)(on) the desk There are a pencil and two pens on the desk. There are a book and two pens on the desk . there were a book and two pens on the desk There a book and two pens on the desk. There is a book and two pens on the desk. 英语在线连词：a ruler is on there some the pens desk and a,ruler,is,on,there,some,the,pens,desk,and把这些词连成一句话 There are some water and two pens on the desk. there ____ a pencil,two pens and there books on the desk,but There __ a book and two pens on the desk.答案是is.为什么